Reformat Ansible Tower error messages

https://bugzilla.redhat.com/show_bug.cgi?id=1439135

app/models/manageiq/providers/ansible_tower/shared/automation_manager/configuration_script.rb

@@ -21,6 +21,12 @@ def create_in_provider(manager_id, params)
       task_ids.each { |tid| MiqTask.wait_for_taskid(tid) }
 
       find_by!(:manager_id => manager.id, :manager_ref => job_template.id)
+    rescue AnsibleTowerClient::Error => err
+      begin
+        raise err.class, JSON.parse(err.message).values.flatten.join(", ")
+      rescue JSON::ParserError
+        raise err
+      end
     end
 
     def update_in_provider(manager_id, params)

spec/support/ansible_shared/automation_manager/configuration_script.rb

@@ -130,6 +130,22 @@
 
         expect { described_class.create_in_provider(manager.id, params) }.to raise_error(ActiveRecord::RecordNotFound)
       end
+
+      context "provider raises on create" do
+        it "with a hash" do
+          expect(AnsibleTowerClient::Connection).to receive(:new).and_return(atc)
+          expect(job_templates).to receive(:create!).and_raise(AnsibleTowerClient::Error, {"name"=>["Job template with this Name already exists."]}.to_json)
+
+          expect { described_class.create_in_provider(manager.id, params) }.to raise_error(AnsibleTowerClient::Error, "Job template with this Name already exists.")
+        end
+
+        it "with a string" do
+          expect(AnsibleTowerClient::Connection).to receive(:new).and_return(atc)
+          expect(job_templates).to receive(:create!).and_raise(AnsibleTowerClient::Error, "Job template with this Name already exists.")
+
+          expect { described_class.create_in_provider(manager.id, params) }.to raise_error(AnsibleTowerClient::Error, "Job template with this Name already exists.")
+        end
+      end
     end
 
     it ".create_in_provider_queue" do